Hi monkey_boy,

Thanks a lot for your answer.
In addition to shltn's question below, which you haven't answered. You mean creating "done$param$ as a dummy file? Note sure why you would "touch" the file..
I have other following questions:

• Why do we need END{}, instead of plain -unblocked- system call?
• It is unclear to me where do you get @done_list. I assume obtaining them by glob? Like these

  # in master.pl
  
  my @done_list = glob("done*");
  
  SLEEPY:
  while (1) 
  {
      sleep(5);
      for my $done (@done_list)
      {
          next SLEEPY if ! -e $done;
      };
      last;
  };
  
  
  # cat files now:
  [download]

• In my case the although the file is created may not indicate that it is completed. Thus the file existence checking with -e may not reflect the completion.
  Does the END block you have guarantees the checking that the file is 100% completed? Please correct me if I'm wrong here.

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